Engines 3

Piston stages in regard to each other

Engine piston are always at different stages of the process to give continuous power

Classification of engines

Number of cylinders, arrangement of cylinders, cooling system, induction system, and propeller drive system

In line engine

All pistons in line, air cooled or liquid cooled, usually 6 cylinders maximum to assist with cooling, can be fitted inverted to help with observation but can lead to hydraulicing

Radial engine

Cylinders arranged in a circle allowing better air cooling, usually a odd number of cylinders, high drag but hydraulicing of lower cylinders

Hydraulicing

Oil may be stuck in the combustion chamber, needs to be pulled through to distribute the oil

V engine

Pistons in a V shape, pistons are high up so no hydrolysing

Horizontally opposed engine

Pistons are 180 degrees from each other, no hydraulicing

Camshaft

The pole that controls the inlets and outlets

Cylinder head Usual material

Aluminium alloy

Cylinder barrel usual material

Steel

Compression rings

Soft material as part of the piston to make a air tight seal

Oil skirt

Spreads oil over the inner surface of the piston

Journal

Center of crankshaft

Throw

Distance from TDC to Journal

Stroke =

2x throw

Which valve is smaller

Exhaust

Tapper clearance

A distance between the rocker and the spring for the valve to make sure the valve doesn’t have leaks

Overhead camshaft

Where the camshaft is overhead so it automatically opens and closes the valves